Heddle frame and weaving loom provided with at least one such frame

ABSTRACT

The frame according to the invention comprises two uprights and two crossbeams, each of which is provided with a catching member adapted to receive a corresponding end of at least one heddle, while there are also provided damping means, fast with at least one corresponding catching member, which are placed opposite surfaces for direct abutment of this catching member against a corresponding heddle. The or each catching member is formed by at least one beat metal sheet, which ensures fixation of the damping means by cooperation of shapes and/or by adhesion.

FIELD OF THE INVENTION

The present invention relates to a heddle frame, as well as to a weaving loom equipped with at least one such frame.

BACKGROUND OF THE INVENTION

It is known to equip a weaving loom with heddle frames which arc intended to be controlled in a movement of vertical oscillations thanks to an appropriate device, such as a weaving system or a dobby.

Such a heddle frame firstly comprises a body, which is formed by reversibly assembling two uprights and two crossbeams. In service, the uprights are substantially vertical, while the crossbeams are substantially horizontal. Each crossbeam also supports a catching member, also called a bar, which allows the fixation of a corresponding end of the heddles of the weaving loom.

The invention aims more particularly at such a heddle frame which is provided with damping means, interposed between the catching member and the heddles, at the level of at least one end of the latter. In this way, during the oscillations of the frame, certain direct contacts between the catching member and the heddles are eliminated, this reducing the vibrations by the heddles rebounding on the bars and, consequently, the overall wear undergone by these different mechanical elements, while increasing the duration of use.

U.S. Pat. No. 3,895,655 describes a heddle frame, which is provided with such vibration damping elements. These resilient elements, which are fixed on each crossbeam, are interposed between the opposite faces of these crossbeams and the heddles, so as to act on the ends of the latter.

However, this known solution presents certain drawbacks, in that it is difficult to master the distance separating these damping elements and the catching member. Furthermore, the operation of fixing these resilient elements proves to be costly, while their presence bestowss a considerable additional mass on the whole of the frame.

It is also known, by U.S. Pat. No. 4,106,529 and U.S. Pat. No. 4,106,530, to insert resilient damping elements between the heddles and the catching members. These damping elements, which are provided on one side or both sides of the catching members, may be disposed freely, or be fixed in grooves made on the catching members.

However, this alternative solution involves other drawbacks.

In effect, if the damping elements are mounted freely, their positioning proves to be unsatisfactory. On the other hand, if they are received in grooves, it is difficult and expensive to produce the catching member, since the afore-mentioned grooves present very small dimensions and are delicate to machine. Furthermore, such a solution contributes to rendering the whole of the catching member particularly heavy.

This being specified, it is an object of the invention to produce a heddle frame enabling the various drawbacks of the prior art set forth hereinabove to be overcome.

In particular, it proposes to produce such a frame which, while being provided with damping means positioned precisely, conserves an acceptable mass and reduced manufacturing costs.

SUMMARY OF THE INVENTION

To that end, the invention relates to a heddle frame for a weaving loom, said frame comprising two uprights and two crossbeams, each crossbeam being provided with a catching member adapted to receive a corresponding end of at least one heddle of said frame, while there are also provided damping means, fast with at least one corresponding catching member, this at least one catching member being formed by at least one bent metal sheet.

The invention also relates to a weaving loom equipped with at least one heddle frame as defined hereinabove.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be more readily understood on reading the following description of a weaving loom and of a plurality of heddle frames in accordance with its principle, given solely by way of non-limiting examples and made with reference to the accompanying drawings, in which:

FIG. 1 schematically shows a weaving loom according to the invention.

FIG. 2 is a view in transverse section, along line II-II in FIG. 1, partially illustrating a heddle frame belonging to the weaving loom of FIG. 1, in particular concerning the mutual connection of a crossbeam, a catching member and a heddle belonging to this frame; and

FIGS. 3 to 9 are views in transverse section, similar to FIG. 2, illustrating seven variant embodiments of the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

Referring now to the drawings, FIG. 1 shows a dobby 1, of type known per se, which is intended to drive a heddle frame 2 belonging to a weaving loom M, in a vertical oscillating movement materialized by arrows F₁ and F′₂. To that end, an actuating arm 1 a of the dobby is coupled to each heddle frame 2, by means of connecting rods and rocking levers. The loom M comprises a plurality of frames, generally between six and twenty four, of which only one is shown in FIG. 1 in order to r ender the drawing clearer.

Each frame 2 comprises a body, which is formed by the assembly of two uprights 4, 4′ and of two crossbeams 6, 6′. Uprights 4, 4′ extend substantially in a direction parallel to that, Z-Z′, of vertical oscillation of the frames, namely vertically in service. Furthermore, crossbeams 6, 6′ extend in a direction Y-Y′, which is perpendicular to that, Z-Z′, mentioned above, namely horizontally in service.

Each upper (6) and lower (6′) crossbeam is respectively equipped, in known manner, with a corresponding catching member, or bar 8, 8′. These bars 8 and 8′, which will be described in greater detail in the following, allow the fixation of the respectively upper and lower ends of different heddles 10, belonging to the frame 2 of the weaving loom M.

FIG. 2 illustrates the fixation of the upper end of a heddle 10 on the upper crossbeam 6, by means of the bar 8. It should be noted that the fixation of the lower end of this heddle 10 on the crossbeam 6′ is effected in similar manner, by means of the bar 8′. In this spirit, the mechanical elements of the lower crossbeam 6′, of the lower bar 8′ and of the lower end of the heddle 10, similar respectively to those of the upper crossbeam 6, the upper bar 8 and the upper end of the heddle 10, bear the same numerals to which the reference “prime” has been added.

The structure of the upper crossbeam 6, which is conventional, will not be described in greater detail in the following. The lower face of this crossbeam 6, facing towards the heddle 10, is extended by a rib 6 ₁ extending over the whole principal dimension of this crossbeam. This rib 6 ₁ is extended by a lug 6 ₂ presenting, in cross section, substantially the shape of a rhombus.

The catching bar 8 is formed by a bent thin metal sheet whose thickness e is for example close to 0.7 mm. It firstly comprises a region 8 ₁, allowing the fixation of the bar 8 on the crossbeam 6, by cooperation of shapes.

More precisely, this region of fixation is formed by two branches 8 ₂₁ and 8 ₂₂, substantially in the form of an L, of which the angles are located opposite each other, so as to cover the afore-mentioned lug 6 ₂. It should also be noted that these branches 8 ₂₁, 8 ₂₂ constitute the free ends of the bent metal sheet, forming the catching bar 8.

Thc existence of this lug 6 ₂, associated with the branches 8 ₂₁ and 8 ₂₂, thus provides the possibility for the fixation of the bar 8 on the crossbeam 6 to be removable.

In this respect, it will be noted that the bent sheet constituting the bar 8 is advantageously elastic and/or pre-stressed.

The two branches 8 ₂₁ and 8 ₂₂ join, opposite the crossbeam 6, in an intermediate region 8 ₃, of reduced cross section. Finally, the latter region extends in a region 8 ₄ intended for catching the heddle 10, which will be described in greater detail hereinbelow.

This heddle 10 conventionally comprises a wire-like element 10 ₁, provided with an eye 10 ₂, visible in FIG. 1, intended for the passage of the warp yarn (not shown). At each end of the heddle, the wire-like element 10 ₁ extends in two principal branches 10 ₃, defining a housing 10 ₄ for receiving the bar 8. The opening of this housing is bordered by two teeth 10 ₅ of the heddle, extending towards each other, so as to form a neck 10 ₆ of reduced transverse dimensions.

Returning to the catching region 8 ₄, the latter presents an approximately rectangular cross section, of which the dimensions are clearly greater than those of the intermediate region 8 ₃. This catching region 8 ₄ forms, in its lower part opposite the crossbeam 6, a U-shaped bend 8 ₅ whose web 8 ₅₁ faces towards the crossbeam 6.

This bend ensures retention of a damping element 12, of type known per se, which is a supple element, made for example of a polymer material, an elastomer material, or the like. Such a damping element, which extends over substantially the whole of the principal dimension of the crossbeam 6, is retained by wedging and/or adhesion in the interior volume of the U-shaped bend 8 ₅.

In configuration of use of the weaving loom M, the intermediate region 8 ₃ is received in the neck 10 ₆, while the catching region 8 ₄ is received in the housing 10 ₄. The same applies to the lower end of the crossbeam, the different mechanical elements being arranged symmetrically with respect to the median horizontal axis of the frame 2.

More precisely, s₁ denotes the surfaces of the upper catching bar 8, which are adapted to come into direct abutment against the opposite surfaces S₁ of the heddle, belonging to the two teeth 10 ₅. These direct abutment surfaces s₁ and S₁ form a zone of traction, opposite the zone of compression, corresponding to the free surfaces of the damping clement 12 and to the opposite ones, C₁, of the heddle 10.

In the static state, as illustrated in FIG. 1, when the upper end of the heddle is in direct abutment against the opposite upper surfaces s₁ of the bar 8, the lower end of this heddle is substantially in abutment against the lower damping element 12′, at the level of its lower compression surfaces C′₁. Of course, when the lower end of the heddle is in direct abutment, by its traction surfaces S′₁, on the surfaces s′₁ of the lower bar 8′, the upper part of this heddle is substantially in abutment, by its upper compression surfaces C₁, against the upper damping clement 12.

Such a measure is advantageous. In effect, the respectively upper (6) and lower (6′) crossbeams are subjected in service to vibrations, this rendering their spaced apart relationship variable. The heddles come into contact, respectively with the bar and with the damping element, sometimes by their traction surfaces and sometimes by their compression surfaces, the shocks on the compression surfaces contributing to damping the vibrations.

The fact of providing a substantially simultaneous abutment on the lower or upper traction surfaces and on the upper or lower compression surfaces, makes it possible for the crossbeams 6 and 6′ to work in a configuration where the heddles are substantially rectilinear. This is favourable to the transmission of a maximum effort of compression. One of the two crossbeams, which ensures a role of damper, therefore absorbs a considerable effort and makes it possible to reduce the flexion of the other crossbeam, in that case ensuring an effort of traction.

In this way, during the oscillations of the frame 2, the presence of the respectively upper (12) and lower (12′) damping elements makes it possible to reduce the axial oscillations/vibrations of the heddles and their shocks on the bars. This therefore ensures a reduction of the overall wear undergone by these heddles and these bars, and consequently an increase in the duration of use thereof.

In FIG. 2, damping means 12 and 12′ equip the respectively upper (8) and lower (8′) bars. However, it may be provided to equip only one of these bars, 8 or 8′, with such damping means, while the other, 8′ or 8, is bereft thereof. In that case, when the single damping means 12 or 12′, fast with the bar 8 or 8′, are in contact with the compression surfaces of the opposite end of the heddle, the other end thereof is advantageously in contact, by its traction surfaces S′₁ or S₁, with the other opposite catching bar 8′ or 8.

FIG. 3 illustrates a first variant embodiment of the invention. In this Figure, the mechanical elements similar to those of FIG. 2 are given the same reference numerals, increased by 100.

The crossbeam 106 has a recess 106 ₁, presenting, in cross section, the form of a rhombus, hollowed out therein. This recess, which is open in the direction of the heddle (not shown), opens towards the outside via a neck, of reduced transverse dimension.

The bar 108 is provided with a region of fixation 108 ₁, which comprises two branches 108 ₂₁ and 108 ₂₂ in the form of an L, forming the free ends of the bent metal sheet constituting the bar 108.

The region of fixation 108, may be introduced in the recess 106 ₁, by pinching the two branches 108 ₂₁ and 108 ₂₂ so that it penetrates through the afore-mentioned neck. These two branches are then applied against the walls 106 ₂ of the recess 106 ₁, by elasticity and/or pre-stress of the metal sheet constituting the bar.

As in the example of FIG. 2, the two branches 108 ₂₁, 108 ₂₂ move towards each other in an intermediate region 108 ₃, of reduced section, which extends it) a catching region 108 ₄. The latter presents a profile substantially similar to that of the region 84 of FIG. 2, apart from thc bend 108 ₅ which presents a U-shaped section whose wings are inclined opposite each other. In other words, this bend 108 ₅ defines a housing which presents larger dimensions at the level of the web 108 ₅₁ of the U than at the level of its opening.

Finally, the bar 108 is provided with a damping element 112 substantially in the form of a mushroom. For example it comprises a stalk 112 ₁ received in the interior volume of the bend 108 ₅, as well as a cap 112 ₂ abutting against the lower face of the bar 108. The mutual connection between this bar 108 and this damping element 112 is effected thanks to a wedging by cooperation of shapes and/or to adhesion.

FIG. 4 illustrates a second variant embodiment of the invention. In this Figure, the mechanical elements similar to those of FIG. 2 are given the same reference numerals, increased by 200.

The catching region 208 ₄ of the bar 208 presents the approximate shape of a rectangle. It is provided with two lower branches 208 ₄₁ which are inclined opposite the crossbeam 206.

Each branch 208 ₄₁ is extended by a corresponding bend 208 ₅, substantially in the form of a V. These two bends 209 ₅ are connected by a terminal connection portion 208 ₆, approximately in the form of an arc of circle.

Moreover, the damping element 212 is hollowed out, with the result that the walls of this recess are applied against the outer face of the branches 208 ₄₁, of the bends 208 ₅ and of the connection portion 208 ₆. This element 212, which is therefore retained in particular at th level of the two bends 208 ₅, is fixed to the bar 208 by cooperation of shapes and/or adhesion.

It should be noted that the damping element 212 presents lateral dimensions greater than those of the catching region 208 ₄. For example, this damping element is provided with two lateral projections 212 ₁, defining two functional clearances denoted J. In service, these projections therefore extend in the vicinity of the branches 210 ₃ of the heddle 210, so as to avoid any contact between these branches and the catching region 208 ₄ of the bar 208.

The catching region 208 ₄ extends, opposite the damping element 212, by an intermediate region 208 ₃, similar to those 83 and 108 ₃ described above. Contrary to the preceding examples, the region 208 ₁ for fixation on the crossbeam 206 is formed by a simple extension of the intermediate region 208 ₃, without modifying the transverse dimensions with respect to the latter. The two branches 208 ₂₁ and 208 ₂₂ are thus fixed permanently on the upper crossbeam 206, particularly by adhesion or by wedging.

FIG. 5 illustrates a third variant embodiment of the invention. In this Figure, the mechanical elements similar to those of FIG. 2 are given the same references numerals, increased by 300.

The bar 308 of FIG. 5 differs from those of the preceding examples in that it is formed by two separate bent metal sheets 309 and 309′. In service, these latter extend, in mutually symmetrical manner with respect to the direction Z-Z′ of vertical oscillation of the frames.

The catching region 308 ₄ therefore differs from those of the preceding examples, in that it is open opposite the crossbeam 306. More precisely, this catching region 308 ₄ is substantially in the form of a U, of which the wings 308 ₄₁ and 308′₄₁ are terminated by reentrant flanges 308 ₅ and 308′₅, of which each belongs to a corresponding bent metal sheet 309 or 309′. These re-entrant flanges thus form bends of the metal sheets constituting the bar 308, while the damping element 312, which is globally solid, has two notches 312 ₁ and 312′₁ hollowed out therein, intended for receiving these flanges 308 ₅ and 308′₅.

The catching region 308 ₄ extends in an intermediate region 308 ₃, which is itself terminated by a region 308 ₁, ensuring fixation of the bar 308 on the crossbeam 6. Precisely, these respectively intermediate (308 ₃) and fixation (308 ₁) regions are constituted by two parallel branches 308 ₂, and 308 ₂₂, of which each belongs to a corresponding bent metal sheet 309 or 309′.

FIG. 6 illustrates a fourth variant embodiment of the invention. In this Figure, the mechanical elements similar to those of FIG. 2 are given the same reference numerals, increased by 400.

The heddle 410 of this embodiment differs from the preceding examples in that it is dissyinmetrical. Each of its ends is thus substantially C-shaped, the wire-like element 410 ₁ being extended by a single branch 410, from which an intermediate tooth 410 ₃ and a return 410 ₃₂ respectively extend. This tooth and this return, which are directed towards each other, define with the branch 410 ₃ two interstices 410 ₄₁, 410 ₄₂.

Furthermore, the bar 408 comprises a zone 408 ₅, bent in the form of a U, in which is housed the damping element 412, which is fixed by cooperation of shapes and/or adhesion. This damping element 412 is provided with a rib 412 ₁, extending towards the wire-like element 410 ₁, which is received in the interstice 410 ₄₁.

One, 408 ₅₂, of the wings of the U-shaped portion 408 ₅ is extended by an intermediate branch 408 ₄, extending along the vertical axis Z-Z′ up to the interstice 410 ₄₂, so as to ensure catching of the heddle 410. This intermediate branch is extended by all end branch 408 ₂, substantially in L-form.

More precisely, this end branch 408 ₂ comprises a portion 408 ₄₁, parallel to the intermediate branch 408 ₄, as well as a terminal portion 408 ₂₂, forming a free end of the bent metal sheet constituting the bar 408. The portion 408 ₄₁ is separated from the opposite walls of the return 410 ₃₂ of the heddle 410, which defines a functional lateral clearance, denoted i, making it possible to avoid substantially all contact between these two mechanical elements.

The terminal portion 408 ₂₂and the wing 408 ₅₂, which are substantially parallel, are bent so as to present a local, increase in their relative separation. This therefore allows the fixation of the bar 408 on a lug 406 ₂ of the crossbeam 406 presenting, in cross section, substantially the shape of a rhombus. This mutual fixation is ensured in similar manner to what was described with reference to the first embodiment illustrated in FIG. 2.

In manner similar to the first embodiment described with reference to FIG. 2, s₂ denotes the surfaces of the catching bar 408, which are adapted to come into direct abutment against the opposite surfaces S₂ of the heddle 410. C₂ likewise denotes the surfaces of the heddle against which the damping element 412 is adapted to come into abutment, by its rib 412 ₁. As may be observed, the damping element 412 is therefore provided opposite the surfaces s₂ for direct abutment of the catching bar 408.

As explained with reference to FIG. 2, when the traction surfaces S₂ of the heddle 410 are in direct abutment against the opposite surfaces s₂ of the bar 408, the lower end (not shown) of this heddle is substantially in abutment against the lower damping element, likewise not shown. In addition, when the lower end of the heddle is in direct abutment, by its lower surfaces of traction, against the opposite surfaces of the lower bar (not shown), the upper end of this heddle is substantially in abutment, by its upper surfaces of compression C₂, against the upper damping element 412.

FIG. 7 illustrates a fifth variant embodiment of the invention. In this Figure, the mechanical elements similar to those of FIG. 2 are given the same reference numerals, increased by 500.

The heddle 510 of this FIG. 7 differs from that of FIG. 6 in that it presents an overall section in the form of a J. For example, it is solely provided with an upper return 510 ₃₂, being bereft of a lower tooth. The branch 510 ₃ of the heddle 510 is distant from the opposite branch 508 ₄ of the bar 508, thus forming a first lateral functional clearance, noted J′.

One, 508 ₅₂, of the wings of the U-shaped portion 508 ₅ is extended by the aforementioned branch 508 ₄, which is partially received in the interstice 510 ₄₂, so as to ensure the catching of the heddle 510. This branch 508 ₄ is terminated by a return 508 ₄₁, extending substantially at 180°, which is placed at a distance from the opposite upper return 510 ₃₂, belonging to the heddle 510, so as to form a second lateral functional clearance, denoted i′.

The other, 508 ₅₃, of the wings of the U-shaped portion 508 ₅, forms a free end of the bar 508. This wing 508 ₅₃ penetrates in a notch made in the damping element 512.

The latter is therefore fitted on this free end 508 ₅₃, such a connection being able, for example, to be completed by adhesion. It should be noted that, as illustrated in this FIG. 7, the damping element 512 does not necessarily extend against the web 508 ₅, and the wing 508 ₅₂ of thc portion 508 ₅.

Furthermore, this damping element 512 is provided with a part 512 ₁, projecting laterally with respect to the branch 508 ₄ of the bar 508. In service, this projection 512, therefore comes into abutment against the branch 510 ₃ of the heddle 510, so as to avoid any contact between this branch of the heddle and the opposite branch 508 ₄ of the bar 508.

Consequently, the mutual lateral friction of the bar and the heddle is substantially eliminated, this contributing to reducing the wear undergone by these two pieces, accordingly.

It should be noted that each of the bars 408 or 508 of FIGS. 6 and 7 can be used equally well with heddles of different shapes, particularly C- or J-shaped. In this way, there is only need to change the damping element 412 or 512, as a function of the use considered.

FIG. 8 illustrates a sixth variant embodiment of the invention.

The heddle 610 of this FIG. 8 is similar to that 410 of FIG. 6. This heddle 610 thus comprises a wire-like body 610, extended by a principal branch 610 ₃, frown which there respectively extend an intermediate tooth 610 ₃₁ and a return 610 ₃₂. This tooth and this return define, with the afore-mentioned principal branch, two interstices 610 ₄₁ and 610 ₄₂, while E denotes the free end of this heddle 610.

The bar 608 comprises a branch for fixation 608 ₆, which is permanently fixed on the crossbeam 606, particularly by adhesion. This branch 608 ₆ is extended upwardly, namely opposite the wire-like body 610 ₁, by a bend 608 ₅, substantially in the form of a U. Similarly to what has been described previously, this bend 608 ₅ ensures the retention of a damping element 612, by wedging and/or adhesion.

The fixation branch 608 ₆ is, in addition, extended, opposite the bend 608 ₅, by a first catching branch 608 ₄, which is received in the interstice 610 ₄₂. This branch 608 ₄ is extended by a first return 608 ₄₁, parallel to the principal branch 610 ₃. This first return is itself extended by a second catching branch 608′₄, received in the interstice 604 ₁, which is terminated by a second return 608′₄₁, directed towards the free end E of the bar.

It should be noted that, contrary to the previous form of embodiment, the damping member 612 is not placed opposite the surfaces for direct abutment of the catching member against the heddle. In effect, in this FIG. 8, this catching member 612 is placed opposite the free end E of the heddle 610, with respect to the wire-like body 610 ₁ thereof.

FIG. 9 illustrates a seventh variant embodiment of the invention. The heddle 710 of this FIG. 9, which is similar to that, 10, of FIG. 2, comprises a wire-like body 710 ₁, which extends in two principal branches 710 ₃, defining a housing 710 ₄ for receiving the bar 708. The opening of this housing is bordered by two teeth 710 ₅ of the heddle, which define a neck 710 ₆ of reduced transverse dimension. Finally E′ denotes the Free end of this heddle, opposite the wire-like body 710 ₁.

The bar 708, which is substantially similar to that, 8, of FIG. 2, comprises a region for fixation formed by two branches 708 ₂₁ and 708 ₂₂, adapted to cover a lug 706 ₂ of the bar 706. Opposite this region of fixation, the bar 708 is equipped with a catching region 708 ₄, which presents an approximately rectangular cross section.

In service, this catching region 708 ₄ is received in the housing 710 ₄ of the heddle 710. However, it will be noted that, contrary to the form of embodiment of FIG. 2, this catching region is bereft of a bend, intended for retaining a damping member.

The region for fixation and thc catching region are mutually connected by an intermediate region 708 ₃ of which a portion is received in the neck 710 ₆. It will be noted that, contrary to the embodiment of FIG. 2, this intermediate region does not present a constant cross section.

In effect, it is provided with two lateral projections 708 ₃₁, substantially U-shaped, which extend symmetrically with respect to the principal vertical axis of the heddle. These two projections 708 ₃, define, opposite the free end E′, two V-shaped bends 708 ₅ intended for the retention by cooperation of shapes and/or by adhesion, of two damping members 712.

It will be noted that, as in the embodiment of FIG. 8, each damping member 712 is placed opposite thc free end E′ of the heddle 710, with respect to the wire-like body 710, thereof. In service, this free end E′ is thus adapted to abut against each of these damping members.

In a variant embodiment, a single projection 708, maybe provided, associated with a single damper 712. By way of additional variant, at least one damper may be fixed directly, for example by adhesion, on a vertical part of the intermediate region 708 ₃, which is in that case bereft of lateral projection.

The invention makes it possible to attain the objects set forth hereinabove.

In effect, the use of a bent metal sheet with a view to making the catching bar, renders manufacture of the latter satisfactorily simple, at a relatively low cost price. Furthermore, this measure makes it possible to reduce the overall mass of the frame with respect to the prior art, while ensuring an easier integration of the damping element, as well as a convenient fixation of the catching member on the crossbeam of the frame.

In addition, the reduced section of the metal sheet constituting the catching bar renders the latter less sensitive to the problems of differential expansion, which the catching members proposed in the prior art do not.

Finally, it should be noted that, thanks to the invention, the operations for installing and replacing the damping element are particularly simple and rapid to carry out. 

1. Heddle frame for weaving loom, said frame comprising two uprights and two crossbeams, each crossbeam being provided with a catching member adapted to receive a corresponding end of at least one heddle of said frame, while damping means are also provided, fast with at least one corresponding catching member, this at least one catching member being formed by at least one bent metal sheet.
 2. The heddle frame of claim 1, wherein the or each bent metal sheet, forming said catching member presents a substantially constant thickness
 3. The heddle frame of claim 2, wherein the thickness of the bent metal sheet is less than 1.5 mm, preferably than 1 mm.
 4. The heddle frame of claim 1, wherein the damping means comprise at least one damping member of which the profile is constant along the catching member.
 5. The heddle frame of claim 4, wherein the or each damping member is fixed on the catching member by adhesion.
 6. The heddle frame of claim 4, wherein the or each damping member is fixed to the catching member by cooperation of shapes.
 7. The heddle frame of claim 1, wherein at least one bend of the or each metal sheet constitutes a zone for receiving and retaining said damping means.
 8. The heddle frame of claim 7, wherein the or each bend for receiving and retaining is substantially in the form of a U.
 9. The heddle frame of claim 7, wherein the or each bend for receiving and retaining is substantially in the form of a V.
 10. The heddle frame of claim 1, wherein the damping means are connected to the catching member at the level of a free end of said bent metal sheet.
 11. The heddle frame of claim 1, wherein the or each heddle presents, at at least one end, two principal branches defining a housing, which opens out in the direction of a corresponding crossbeam via a neck, while the corresponding catching member comprises a catching region extending in service in said housing, as well as an intermediate region received in service in said neck.
 12. The heddle frame of claim 1, wherein the or each heddle presents, at at least one end, a principal branch defining, with a tooth and/or a return of this heddle, at least one receiving interstice, while the corresponding catching member presents at least one catching branch housed in the or each interstice.
 13. The heddle frame of claim 12, wherein the catching branch is extended by a return, bent to about 180° with respect to this catching branch, this return of the catching member lying laterally at a distance from the opposite return of the heddle.
 14. The heddle frame of claim 1, wherein the damping means are placed opposite surfaces for direct abutment of this at least one catching member against a corresponding heddle.
 15. The heddle frame of claim 11, wherein the damping means are provided with at least one lateral projection extending in the direction of the or each principal branch of the heddle, so as to laterally separate this principal branch with respect to the catching region of the catching member and thus to avoid substantially all lateral friction between the or each principal branch and this catching region.
 16. The heddle frame of claim 11, wherein the damping means are placed opposite a free end of the heddle, with respect to a wire-like body of this heddle.
 17. The heddle frame of claim 1, wherein means are provided for removably fixing the or each catching member on a corresponding crossbeam.
 18. The heddle frame of claim 17, wherein the removable fixing means are means for fixation by cooperation of shapes, particularly by pinching and/or by wedging.
 19. The heddle frame of claim 1, wherein the bent metal sheet is elastic and/or pre-stressed.
 20. The heddle frame of claim 18, wherein the means for removable fixation by cooperation of shapes comprise two branches of said bent sheet, as well as opposite walls of the crossbeam.
 21. The heddle frame of claim 20, wherein the two branches cover, in service, a lug of the crossbeam.
 22. The heddle frame of claim 20, wherein the two branches are applied, in service, against walls of a recess made in the crossbeam.
 23. The heddle frame of claim 1, wherein the catching member is permanently fixed on the crossbeam, particularly by adhesion or by riveting.
 24. The heddle frame of claim 1, wherein, at least in the static state of said frame, when surfaces for direct abutment of a first and/or of a second end of the or each heddle are in contact with said surfaces for direct abutment of a first and/or a second catching member, compression surfaces of a second and/or a first end of the heddle are substantially in contact with opposite surfaces of damping means fast with a second and/or a first catching member.
 25. Weaving loom equipped with at least one heddle frame according to claim
 1. 